ては[初「はじ」]めて => Only after A did (I) B N3
Time, Situation
手前 => considering; before; in front of; one’s standpoint N1
のが上手 => to be good at doing something N5
のが下手 => to be bad at doing something N5
~んがため(に)/~んがための      => in order to ~ N1
ため(に) => For, because… N4
Cause and Effect
~にしてはじめて      => since at ~ N1
めったに~ない => hardly; rarely; seldom N3
めったにない => Rarely N3
Degree. Level, Amount
そのため(に) => hence; for that reason; because of ~ N3
かりそめにも => Whatever it is..., do not.... N1
Position, perspective
にめんして => having a space looking towards N N2
Situation, case